/*
 * 
 * 
 * This file is part of Group Explorer.
 * Copyright 2005 Nathan Carter
 * 
 * Group Explorer is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * Group Explorer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with Group Explorer; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linking Group Explorer statically or dynamically with other modules is
 * making a combined work based on Group Explorer.  Thus, the terms and
 * conditions of the GNU General Public License cover the whole combination.
 * 
 * In addition, as a special exception, the copyright holders of Group
 * Explorer give you permission to combine Group Explorer program with free
 * software programs or libraries that are released under the GNU LGPL and
 * with code included in the standard release of the Qt Undo/Redo Framework
 * under its standard license (or modified versions of such code, with
 * unchanged license). You may copy and distribute such a system following
 * the terms of the GNU GPL for Group Explorer and the licenses of the other
 * code concerned, provided that you include the source code of that other
 * code when and as the GNU GPL requires distribution of source code.
 * 
 * Note that people who make modified versions of Group Explorer are not
 * obligated to grant this special exception for their modified versions; it
 * is their choice whether to do so. The GNU General Public License gives
 * permission to release a modified version without this exception; this
 * exception also makes it possible to release a modified version which
 * carries forward this exception.
 * 
 * 
 * 
 */


#ifndef GLMODELVIEW_H
#define GLMODELVIEW_H


#include <qgl.h>
#include "glsceneview.h"


class GLModelView : public GLSceneView
{
    Q_OBJECT

public:
	GLModelView ( QWidget* parent = 0, const char* name = 0 );

	void setCameraPosition ( GLdouble x, GLdouble y, GLdouble z );
	void getCameraPosition ( GLdouble& x, GLdouble& y, GLdouble& z );
    GLdouble distanceFromEye ( GLdouble wx, GLdouble wy, GLdouble wz );

	void setRotateAllowed ( bool allowed = TRUE );
	void setRotateButtonState ( Qt::ButtonState state );
	void setDragAllowed ( bool allowed = TRUE );
	void setDragButtonState ( Qt::ButtonState state );
	void setOtherAllowed ( bool allowed = TRUE );
	void setOtherButtonState ( Qt::ButtonState state );

    void setZoomLimits ( GLdouble mindistance, GLdouble maxdistance );

public slots:
    void zoomIn ( GLdouble distance = 1.0 );
    void zoomOut ( GLdouble distance = 1.0 );
    void zoomInByFactor ( GLdouble factor = 0.1 );
    void zoomOutByFactor ( GLdouble factor = 0.1 );

signals:
    void startDrag ( QPoint from );
    void finishDrag ( QPoint from, QPoint to );
    void startOther ( QPoint orig );
    void duringOther ( QPoint prev, QPoint now );
    void finishOther ( QPoint orig, QPoint now );

protected:
    virtual void mousePressEvent ( QMouseEvent* e );
	virtual void mouseMoveEvent ( QMouseEvent* e );
    virtual void mouseReleaseEvent ( QMouseEvent* e );
	virtual void setupModelviewMatrix ();

private:
	GLdouble cameraPosition[3];

	bool allowRotate;
	Qt::ButtonState rotateButtonState;
	bool allowDrag;
	Qt::ButtonState dragButtonState;
    QPoint dragStart;
    bool allowOther;
    Qt::ButtonState otherButtonState;
    QPoint otherStart;
    QPoint otherLast;
    GLdouble minzoomdist;
    GLdouble maxzoomdist;

};


#endif // GLMODELVIEW_H

